Machine



(No Model.) 3 Sheets-Sheet 1. J. W. POST. SEWING MACHINE.

MET e ii R J H w Patented Feb. 17, 1885. v III inf-5i--- ":i;-:;: &

(N0 Modem 3 Sheets-Sheet 2. J. W. POST.

SEWING MACHINE.

No. 812,509. Patented Feb. 17, 1885.

.4T cly 2 Wad MM No Model.) 3 Sheets--Sheet 3. J. W. POST.

SEWING MACHINE.

No. 312,509 Patented Pgb. 17, 1885.

UNITED STATES PATENT .rr cn.

JOHN 7. POST, OF NEW YORK, N.-Y.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 312,509, dated February 17, 1885.

Application filed July 14, 1883.

To all whom it may concern.-

Be it known that I, JOHN WV. PosT, a citizen of the United States, residing at New York, in the county of New York and State drawings.

The object of my invention is the production of a sewing-machine which, while it is so simple in contruction that it may be sold at the price usually asked for what are known as toy SeWingmachines, is so efficient in operation that it will sew as well as many of the high-priced family sewing-machines.

In the accompanying drawings, Figure 1 is a sectional side elevation of a sewing-machine embodying my invention. Fig. 2is a reverse plan view of the same. Fig. 3 is a front elevation with the bed-plate in section. Fig. 4 is a sectional view of the head and a portion of the bracket-arm. Fig. 5 is a sectional detail of the needle-lever and its bearing, and Fig. 6 is a perspective detail of the tension device.

A is the bed-plate, to which is secured the bracket-arm B, the latter being formed solid and in one piece, the head 0 of said bracketarm being preferably formed integral therewith, as shown.

Cast integral with the bed-plate A are small legs a and lugs a, the latter affording bearings for the driving-shaft D, which is preferably cast in one piece with the fly-wheel D, having a driving-pulley, d, and the needle operating eccentric D On the forward end of the driving-shaft is formed an eccentric, D", for operating the feedbar E, the latter carrying a feed dog, E, of ordinary construction. The eccentric D works in a slot in said feed-bar in a well-known manner, and moves the same forward in opposition to the stress of a coiled spring arranged in a recess in said bar and against the pin on which the latter is pivoted. The throw of the feed-bar is regulated by an adjusting-lever, E To the forward end of the driving-shaft a rotary chain-stitch hook or looper, F, is secured in a well-known manner.

In the head 0 of the bracket-arm are formed vertical bearings for the needle-bar G, carrythrough the same.

(N0 model.)

[ ing the usual eye-pointed needle, and the presser-bar H, having a presser'foot, h, of ordinary construction, said resser-foot being yieldingly held upon the work by a coiled spring, 'h encircling the presser-bar, and the latter being raised, when required, by a lifting-lever, h". The needle-bar G receiyesits movement from the eccentric D on the driving-shaft through the connecting rod I and needle-lever J, the latter being provided. at its rear end with a ball, j, which is surrounded by a yoke, t, on the upper end of the connecting-rod. To prevent said yoke from coming off from said ball, a set-screw, i is passed through the former into aseat or recess, j, in

the latter, as clearly shown in Fig. 5.1 The forward end of the needle-lever is provided with a fork embracing a screw-pin, g, on the needle-bar, the prongs of the fork being adjusted to take up wear by a screw, j passing The needle-lever J is pivoted on a stud or pin, J, preferably formed conical and integral with said needle-lever, as shown in Fig. 5, said pin fitting in a conical bearing in the bracket-arm 13, and being held in said bearing by a screw, J As the pin or stud J is slightly shorter that the bearing in the bracket-arm, it is obvious that any wear of the said stud J or its bearing may be compensated for simply by tightening the screw J By arranging the adj usting-screw J at the back of the bracket-arm, or on the side of the said arm opposite to that on which the needlelever is placed, a projecting nut or screwhead on the front of the machine is avoided, thus giving this part of the machine a neat and smooth front.

The tension device consists of a spring, K, secured to the top of the bracket-arm B by a single screw, K", by which the stress of said spring may be adjusted. The rear end of the tension-spring K is bent at a right angle, the lower end of the vertical portion of said rear end being preferably formed with a concave seat fitting on the round bracket-arm. The forward end of the tension-spring K bears on the top of the head 0, the thread being passed between said spring and the upper surface of said head. A supplementary or check tensionspring, L, is secured to the front of the head 0 by a single screw, Z by which the stress of said spring may be adjusted, the free end of loop, 9 secured to the upper end of the neesaid springLbeing steadied between two pins, 1 Z Z, preferably arranged in different vertical planes, as shown in Fig. 3, so that they will serve as guides for the thread, which passes between them beneath the spring L. Awire dle-bar G, serves as a take-up to tighten the stitches.

To prevent the needle and presser bars from turning in their bearings, the head 0 is provided with a slot, 0, into which the ends of the screw-pins g and h", passing through the needle and presser bars, respectively, project. One wall of this slot is preferably formed by aremovable plate, 0, secured to the head by screws 0.

It is obvious that any wear of the pins 9 and h in the slot 0 may be compensated for by tightening the screws 0 thus enabling a single adjustable device to take up the wear of both of these pins. The thread passes from the spool M between the outer end of the tensionspring K and the upper surface of the head G, .thus receiving its requisite tension. From .the tension-spring the thread passes through the take-up loop thence beneath the check tension-spring L aed through the guide-eye N to the eye of the needle.

If it is desired to drive my machine by hand, a driving-pulley, D, (indicated by dotted lines in Fig. 1,) provided with a handle, may be secured to the rear end of the bracket-arm B by a screw, D entering a threaded socket, b, Fig. 5, in said arm. A belt will run from the pulley D" to the pulley d on the driving-shaft.

As the operation of my machine in sewing is essentially the same as that of the Wellknown \Villcox 8t Gibbs chain stitch machine, it will be fully understood by those skilled in the art without further description. I do not herein claim the tension devices above described, as this part of my invention is embraced by my application, Serial No. 153,652, filed January 22, 1885, which is a division of this application.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a sewing-machine, the combination, with a bracket-arm having a conical bearing, of aneedle-lever having a conical fulcrum-stud formed integral therewith, said stud being slightly shorter than said bearing, and means arranged on the side of said bracket-arm opposite to the said lever for securing and adjusting said stud in said bearing, substantially as described.

2. The bracket-arm B, provided with a conical bearing, in combination with the needlelever J, having a conical fulcrum-stud, J formed integral with said lever, said stud being slightly shorter than said bearing, and the securing and adjusting screw J arranged on the side of said bracket-arm opposite to the said lever, substantially as, described.

3. The combination, with the head 0, having a slot, of the needle and presser bars provided with pins entering said slot, and a single and adjustable device for compensating for the wear of said pins in said slot, substantially as described.

4. The combination, with the head 0, having the slot 0, of the needle and presser bars having pins entering said slot, and the adjustable and removable plate 0, substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN W. POST.

Witnesses:

WARREN G. STONE, WVM. E. RoGERs. 

